PREPREG, AND FIBER-REINFORCED COMPOSITE MATERIAL

摘要

[Problem] To provide a fiber-reinforced composite material that improves interlaminar fracture toughness and provides high heat resistance. [Solution] A prepeg contains reinforced fibers (A) and a resin composition (E), wherein the resin composition (E) contains 0.1 to 10 mass% of particles (D) comprising an ultrahigh molecular weight olefin polymer, which satisfies requirements (i) and (ii) below, or a crosslinked product thereof, and contains a thermosetting resin (B) and a curing agent (C). (i) The intrinsic viscosity [η] of the ultrahigh molecular weight olefin polymer constituting the particles is 5 to 50 dl/g, as measured in decalin solvent at 135°C. (ii) The average particle size (d50) is 3 to 200 μm.